[NETFILTER]: x_tables: unify IPv4/IPv6 esp match
This unifies ipt_esp and ip6t_esp to xt_esp. Please note that now
a user program needs to specify IPPROTO_ESP as protocol to use esp match
with IPv6. This means that ip6tables requires '-p esp' like iptables.
Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 882b842..ebbd644 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -272,12 +272,12 @@
To compile it as a module, choose M here. If unsure, say N.
-config IP_NF_MATCH_AH_ESP
- tristate "AH/ESP match support"
+config IP_NF_MATCH_AH
+ tristate "AH match support"
depends on IP_NF_IPTABLES
help
- These two match extensions (`ah' and `esp') allow you to match a
- range of SPIs inside AH or ESP headers of IPSec packets.
+ This match extension allows you to match a range of SPIs
+ inside AH header of IPSec packets.
To compile it as a module, choose M here. If unsure, say N.
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index f2cd9a6..09ae167 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -59,7 +59,7 @@
obj-$(CONFIG_IP_NF_MATCH_RECENT) += ipt_recent.o
obj-$(CONFIG_IP_NF_MATCH_ECN) += ipt_ecn.o
obj-$(CONFIG_IP_NF_MATCH_DSCP) += ipt_dscp.o
-obj-$(CONFIG_IP_NF_MATCH_AH_ESP) += ipt_ah.o ipt_esp.o
+obj-$(CONFIG_IP_NF_MATCH_AH) += ipt_ah.o
obj-$(CONFIG_IP_NF_MATCH_TTL) += ipt_ttl.o
obj-$(CONFIG_IP_NF_MATCH_ADDRTYPE) += ipt_addrtype.o
diff --git a/net/ipv4/netfilter/ipt_esp.c b/net/ipv4/netfilter/ipt_esp.c
deleted file mode 100644
index 3840b41..0000000
--- a/net/ipv4/netfilter/ipt_esp.c
+++ /dev/null
@@ -1,111 +0,0 @@
-/* Kernel module to match ESP parameters. */
-
-/* (C) 1999-2000 Yon Uriarte <yon@astaro.de>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/module.h>
-#include <linux/skbuff.h>
-#include <linux/ip.h>
-
-#include <linux/netfilter_ipv4/ipt_esp.h>
-#include <linux/netfilter_ipv4/ip_tables.h>
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Yon Uriarte <yon@astaro.de>");
-MODULE_DESCRIPTION("iptables ESP SPI match module");
-
-#ifdef DEBUG_CONNTRACK
-#define duprintf(format, args...) printk(format , ## args)
-#else
-#define duprintf(format, args...)
-#endif
-
-/* Returns 1 if the spi is matched by the range, 0 otherwise */
-static inline int
-spi_match(u_int32_t min, u_int32_t max, u_int32_t spi, int invert)
-{
- int r=0;
- duprintf("esp spi_match:%c 0x%x <= 0x%x <= 0x%x",invert? '!':' ',
- min,spi,max);
- r=(spi >= min && spi <= max) ^ invert;
- duprintf(" result %s\n",r? "PASS" : "FAILED");
- return r;
-}
-
-static int
-match(const struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- const struct xt_match *match,
- const void *matchinfo,
- int offset,
- unsigned int protoff,
- int *hotdrop)
-{
- struct ip_esp_hdr _esp, *eh;
- const struct ipt_esp *espinfo = matchinfo;
-
- /* Must not be a fragment. */
- if (offset)
- return 0;
-
- eh = skb_header_pointer(skb, protoff,
- sizeof(_esp), &_esp);
- if (eh == NULL) {
- /* We've been asked to examine this packet, and we
- * can't. Hence, no choice but to drop.
- */
- duprintf("Dropping evil ESP tinygram.\n");
- *hotdrop = 1;
- return 0;
- }
-
- return spi_match(espinfo->spis[0], espinfo->spis[1],
- ntohl(eh->spi),
- !!(espinfo->invflags & IPT_ESP_INV_SPI));
-}
-
-/* Called when user tries to insert an entry of this type. */
-static int
-checkentry(const char *tablename,
- const void *ip_void,
- const struct xt_match *match,
- void *matchinfo,
- unsigned int matchinfosize,
- unsigned int hook_mask)
-{
- const struct ipt_esp *espinfo = matchinfo;
-
- /* Must specify no unknown invflags */
- if (espinfo->invflags & ~IPT_ESP_INV_MASK) {
- duprintf("ipt_esp: unknown flags %X\n", espinfo->invflags);
- return 0;
- }
- return 1;
-}
-
-static struct ipt_match esp_match = {
- .name = "esp",
- .match = match,
- .matchsize = sizeof(struct ipt_esp),
- .proto = IPPROTO_ESP,
- .checkentry = checkentry,
- .me = THIS_MODULE,
-};
-
-static int __init ipt_esp_init(void)
-{
- return ipt_register_match(&esp_match);
-}
-
-static void __exit ipt_esp_fini(void)
-{
- ipt_unregister_match(&esp_match);
-}
-
-module_init(ipt_esp_init);
-module_exit(ipt_esp_fini);
diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index 98f7875..bdd569f 100644
--- a/net/ipv6/netfilter/Kconfig
+++ b/net/ipv6/netfilter/Kconfig
@@ -115,11 +115,11 @@
To compile it as a module, choose M here. If unsure, say N.
-config IP6_NF_MATCH_AHESP
- tristate "AH/ESP match support"
+config IP6_NF_MATCH_AH
+ tristate "AH match support"
depends on IP6_NF_IPTABLES
help
- This module allows one to match AH and ESP packets.
+ This module allows one to match AH packets.
To compile it as a module, choose M here. If unsure, say N.
diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile
index 8436a1a..c387170 100644
--- a/net/ipv6/netfilter/Makefile
+++ b/net/ipv6/netfilter/Makefile
@@ -8,7 +8,7 @@
obj-$(CONFIG_IP6_NF_MATCH_OPTS) += ip6t_hbh.o ip6t_dst.o
obj-$(CONFIG_IP6_NF_MATCH_IPV6HEADER) += ip6t_ipv6header.o
obj-$(CONFIG_IP6_NF_MATCH_FRAG) += ip6t_frag.o
-obj-$(CONFIG_IP6_NF_MATCH_AHESP) += ip6t_esp.o ip6t_ah.o
+obj-$(CONFIG_IP6_NF_MATCH_AH) += ip6t_ah.o
obj-$(CONFIG_IP6_NF_MATCH_EUI64) += ip6t_eui64.o
obj-$(CONFIG_IP6_NF_MATCH_MULTIPORT) += ip6t_multiport.o
obj-$(CONFIG_IP6_NF_MATCH_OWNER) += ip6t_owner.o
diff --git a/net/ipv6/netfilter/ip6t_esp.c b/net/ipv6/netfilter/ip6t_esp.c
deleted file mode 100644
index 36bedad..0000000
--- a/net/ipv6/netfilter/ip6t_esp.c
+++ /dev/null
@@ -1,115 +0,0 @@
-/* Kernel module to match ESP parameters. */
-/* (C) 2001-2002 Andras Kis-Szabo <kisza@sch.bme.hu>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-
-#include <linux/module.h>
-#include <linux/skbuff.h>
-#include <linux/ip.h>
-#include <linux/ipv6.h>
-#include <linux/types.h>
-#include <net/checksum.h>
-#include <net/ipv6.h>
-
-#include <linux/netfilter_ipv6/ip6_tables.h>
-#include <linux/netfilter_ipv6/ip6t_esp.h>
-
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("IPv6 ESP match");
-MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");
-
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-
-/* Returns 1 if the spi is matched by the range, 0 otherwise */
-static inline int
-spi_match(u_int32_t min, u_int32_t max, u_int32_t spi, int invert)
-{
- int r=0;
- DEBUGP("esp spi_match:%c 0x%x <= 0x%x <= 0x%x",invert? '!':' ',
- min,spi,max);
- r=(spi >= min && spi <= max) ^ invert;
- DEBUGP(" result %s\n",r? "PASS\n" : "FAILED\n");
- return r;
-}
-
-static int
-match(const struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- const struct xt_match *match,
- const void *matchinfo,
- int offset,
- unsigned int protoff,
- int *hotdrop)
-{
- struct ip_esp_hdr _esp, *eh;
- const struct ip6t_esp *espinfo = matchinfo;
- unsigned int ptr;
-
- /* Make sure this isn't an evil packet */
- /*DEBUGP("ipv6_esp entered \n");*/
-
- if (ipv6_find_hdr(skb, &ptr, NEXTHDR_ESP, NULL) < 0)
- return 0;
-
- eh = skb_header_pointer(skb, ptr, sizeof(_esp), &_esp);
- if (eh == NULL) {
- *hotdrop = 1;
- return 0;
- }
-
- DEBUGP("IPv6 ESP SPI %u %08X\n", ntohl(eh->spi), ntohl(eh->spi));
-
- return (eh != NULL)
- && spi_match(espinfo->spis[0], espinfo->spis[1],
- ntohl(eh->spi),
- !!(espinfo->invflags & IP6T_ESP_INV_SPI));
-}
-
-/* Called when user tries to insert an entry of this type. */
-static int
-checkentry(const char *tablename,
- const void *ip,
- const struct xt_match *match,
- void *matchinfo,
- unsigned int matchinfosize,
- unsigned int hook_mask)
-{
- const struct ip6t_esp *espinfo = matchinfo;
-
- if (espinfo->invflags & ~IP6T_ESP_INV_MASK) {
- DEBUGP("ip6t_esp: unknown flags %X\n",
- espinfo->invflags);
- return 0;
- }
- return 1;
-}
-
-static struct ip6t_match esp_match = {
- .name = "esp",
- .match = match,
- .matchsize = sizeof(struct ip6t_esp),
- .checkentry = checkentry,
- .me = THIS_MODULE,
-};
-
-static int __init ip6t_esp_init(void)
-{
- return ip6t_register_match(&esp_match);
-}
-
-static void __exit ip6t_esp_fini(void)
-{
- ip6t_unregister_match(&esp_match);
-}
-
-module_init(ip6t_esp_init);
-module_exit(ip6t_esp_fini);
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 332acb3..5fe5189 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -231,6 +231,15 @@
If you want to compile it as a module, say M here and read
<file:Documentation/modules.txt>. If unsure, say `N'.
+config NETFILTER_XT_MATCH_ESP
+ tristate '"ESP" match support'
+ depends on NETFILTER_XTABLES
+ help
+ This match extension allows you to match a range of SPIs
+ inside ESP header of IPSec packets.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
config NETFILTER_XT_MATCH_HELPER
tristate '"helper" match support'
depends on NETFILTER_XTABLES
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 9558727..8f02486 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -35,6 +35,7 @@
obj-$(CONFIG_NETFILTER_XT_MATCH_CONNMARK) += xt_connmark.o
obj-$(CONFIG_NETFILTER_XT_MATCH_CONNTRACK) += xt_conntrack.o
obj-$(CONFIG_NETFILTER_XT_MATCH_DCCP) += xt_dccp.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_ESP) += xt_esp.o
obj-$(CONFIG_NETFILTER_XT_MATCH_HELPER) += xt_helper.o
obj-$(CONFIG_NETFILTER_XT_MATCH_LENGTH) += xt_length.o
obj-$(CONFIG_NETFILTER_XT_MATCH_LIMIT) += xt_limit.o
diff --git a/net/netfilter/xt_esp.c b/net/netfilter/xt_esp.c
new file mode 100644
index 0000000..9dad6281
--- /dev/null
+++ b/net/netfilter/xt_esp.c
@@ -0,0 +1,136 @@
+/* Kernel module to match ESP parameters. */
+
+/* (C) 1999-2000 Yon Uriarte <yon@astaro.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+
+#include <linux/netfilter/xt_esp.h>
+#include <linux/netfilter/x_tables.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Yon Uriarte <yon@astaro.de>");
+MODULE_DESCRIPTION("x_tables ESP SPI match module");
+MODULE_ALIAS("ipt_esp");
+MODULE_ALIAS("ip6t_esp");
+
+#if 0
+#define duprintf(format, args...) printk(format , ## args)
+#else
+#define duprintf(format, args...)
+#endif
+
+/* Returns 1 if the spi is matched by the range, 0 otherwise */
+static inline int
+spi_match(u_int32_t min, u_int32_t max, u_int32_t spi, int invert)
+{
+ int r = 0;
+ duprintf("esp spi_match:%c 0x%x <= 0x%x <= 0x%x", invert ? '!' : ' ',
+ min, spi, max);
+ r = (spi >= min && spi <= max) ^ invert;
+ duprintf(" result %s\n", r ? "PASS" : "FAILED");
+ return r;
+}
+
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const struct xt_match *match,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ struct ip_esp_hdr _esp, *eh;
+ const struct xt_esp *espinfo = matchinfo;
+
+ /* Must not be a fragment. */
+ if (offset)
+ return 0;
+
+ eh = skb_header_pointer(skb, protoff, sizeof(_esp), &_esp);
+ if (eh == NULL) {
+ /* We've been asked to examine this packet, and we
+ * can't. Hence, no choice but to drop.
+ */
+ duprintf("Dropping evil ESP tinygram.\n");
+ *hotdrop = 1;
+ return 0;
+ }
+
+ return spi_match(espinfo->spis[0], espinfo->spis[1], ntohl(eh->spi),
+ !!(espinfo->invflags & XT_ESP_INV_SPI));
+}
+
+/* Called when user tries to insert an entry of this type. */
+static int
+checkentry(const char *tablename,
+ const void *ip_void,
+ const struct xt_match *match,
+ void *matchinfo,
+ unsigned int matchinfosize,
+ unsigned int hook_mask)
+{
+ const struct xt_esp *espinfo = matchinfo;
+
+ if (espinfo->invflags & ~XT_ESP_INV_MASK) {
+ duprintf("xt_esp: unknown flags %X\n", espinfo->invflags);
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct xt_match esp_match = {
+ .name = "esp",
+ .family = AF_INET,
+ .proto = IPPROTO_ESP,
+ .match = &match,
+ .matchsize = sizeof(struct xt_esp),
+ .checkentry = &checkentry,
+ .me = THIS_MODULE,
+};
+
+static struct xt_match esp6_match = {
+ .name = "esp",
+ .family = AF_INET6,
+ .proto = IPPROTO_ESP,
+ .match = &match,
+ .matchsize = sizeof(struct xt_esp),
+ .checkentry = &checkentry,
+ .me = THIS_MODULE,
+};
+
+static int __init xt_esp_init(void)
+{
+ int ret;
+ ret = xt_register_match(&esp_match);
+ if (ret)
+ return ret;
+
+ ret = xt_register_match(&esp6_match);
+ if (ret)
+ xt_unregister_match(&esp_match);
+
+ return ret;
+}
+
+static void __exit xt_esp_cleanup(void)
+{
+ xt_unregister_match(&esp_match);
+ xt_unregister_match(&esp6_match);
+}
+
+module_init(xt_esp_init);
+module_exit(xt_esp_cleanup);
